Child Language Development, Disorders, Assessment, and Intervention

Vocabulary practice flashcards covering fundamental terminology, developmental milestones, diagnostic categories, assessment types, intervention approaches, and clinical profiles in child language disorders.

Language

A rule-governed system of words, morphemes, and symbols that is a learned behavior, specific to humans, and manifested across spoken, written, or visual (gesture for sign language) modalities.

Speech

The oral expression of language involving the production of specific sounds through neurological control of physical movement, respiration, phonation, and articulation.

Communication

The act of conveying meaning and intention by sending and receiving messages, information, ideas, and feelings through any behavior or act, which is not limited to humans.

Language Form

The structural and grammatical domain of language comprising phonology, morphology, and syntax across both comprehension and production.

Language Content

The domain of language encompassing vocabulary and semantic meaning of words and word combinations.

Language Use

The functional and communicative domain of language that includes pragmatics, conversational rules, and social communication.

Developmental Language Disorder (DLD)

A significant impairment in the comprehension, production, or use of spoken, written, or other symbol language without an obvious known biomedical disorder, diagnosed when it interferes with societal expectations in social relationships, academics, or employment.

Synaptic Pruning

A neurodevelopmental process that eliminates weak or underused connections to strengthen remaining pathways, leading to functional specialization and greater localization of information processing in the brain.

Comorbidity

A clinical situation in which a child experiences two or more developmental or behavioral disorders simultaneously.

Phoneme

The smallest unit of sound in spoken language that distinguishes one word from another in a particular language.

Perlocutionary Period

The initial pre-linguistic developmental phase from $0\text{ to }7\text{ months}$ where an infant reacts spontaneously to physiological sensations without communicative intent, which caregivers interpret as intentional communication.

Illocutionary Stage

The pre-linguistic phase from $8\text{ to }14\text{ months}$ characterized by intentional communication using gestures and vocalizations (canonical babbling) before conventional words are spoken.

Contact Gesture

A pre-linguistic physical gesture where an infant takes an adult's hand to place it onto a desired object or uses physical contact to push an unwanted object away.

Distal Gesture

A communicative gesture performed at a distance without physical contact, such as pointing, waving, shaking the head, showing, or offering.

Locutionary Stage

The linguistic stage emerging at $12\text{ to }14\text{ months}$ where a child begins using conventional words and symbolic gestures to express meaning.

Protoword

A phonetically consistent, idiosyncratic vocal form used reliably by an infant to refer to a specific object before adult-like word forms emerge (e.g., saying "gaga" to request water).

Overextension

A vocabulary error common during early lexical development where a child applies a word too broadly to referents beyond its actual category boundaries.

Underextension

A vocabulary error where a child restricts the meaning of a word too narrowly, applying it only to a specific exemplar rather than the entire category.

Infant-Directed Speech

A specialized register used by caregivers featuring higher and exaggerated pitch, slower rate, restricted vocabulary, varied loudness, and shorter, repetitive utterances to facilitate language acquisition.

Joint Attention

A social communication skill emerging at $10\text{ to }12\text{ months}$ where an infant and an adult coordinate their shared attention toward both an external object and each other via pointing and gaze following.

Mean Length of Utterance (MLU)

A clinical metric computed as $\text{MLU} = \frac{\text{Total number of morphemes}}{\text{Total number of utterances}}$, providing an index of grammatical complexity and expressive language proficiency.

Brown's Stage I

A stage of morphosyntactic development from $1\text{ to }2.2\text{ years}$ ($\text{MLU} = 1.0\text{--}2.0$) characterized by single words, linear simple sentences, two-word combinations, semantic roles, and few or no grammatical morphemes.

Brown's Stage II

A stage of development from $2.3\text{ to }2.6\text{ years}$ ($\text{MLU} = 2.0\text{--}2.5$) marking the onset of morpheme development, including present progressive "-ing", prepositions "in" and "on", irregular past tense, plural "-s", and copula "is/are".

Brown's Stage III

A stage of development from $2.7\text{ to }2.10\text{ years}$ ($\text{MLU} = 2.5\text{--}3.0$) characterized by sentence form development, expanded noun phrases, possessive "-s", and uncontractible copula "be" as the main verb.

Brown's Stage IV

A stage of development from $2.11\text{ to }3.4\text{ years}$ ($\text{MLU} = 3.0\text{--}3.75$) characterized by sentence embedding, complex sentences, articles ("a", "the"), and regular past tense overregularization.

Brown's Stage V

A stage of development from $3.5\text{ to }3.10\text{ years}$ ($\text{MLU} = 3.75\text{--}4.5$) characterized by compound sentences, clause conjoining, regular third-person singular "-s", irregular third-person singular, and uncontractible auxiliary forms.

Expository Text

A non-fiction text genre characteristic of intermediate-grade textbooks designed to convey facts, descriptions, and informational content rather than narrative story structure.

Comprehension Monitoring

A metacognitive ability developing at age $6+$ that involves consciously evaluating and tracking one's own understanding of spoken or written discourse.

Coherence

The structural quality of a narrative in which events and ideas are meaningfully ordered and logically sequenced across the entire discourse.

Cohesion

The use of explicit linguistic markers, conjunctions, and pronominal references to link sentences together within a text.

Story Grammar

The internal schematic elements that constitute a narrative, including setting episode, initiating event, internal problem or obstacle, and resolution, emerging between ages $5\text{ and }8$.

Theory of Mind

The cognitive ability emerging around age $5$ to understand that other people have private thoughts, beliefs, feelings, and perspectives distinct from one's own.

Metalinguistics

The ability to treat language as an object of conscious thought and reflection, enabling an individual to judge grammatical correctness and manipulate language structures.

Metapragmatics

The conscious awareness of the rules governing language use and the knowledge of which communicative styles are appropriate for different social contexts.

Metacognition

The executive capacity of thinking about thinking and knowing about knowing, including monitoring knowledge states, deploying learning strategies, and self-correcting.

Phonological Awareness

The metalinguistic ability to reflect upon and manipulate the sound units of spoken language, encompassing syllables, onset-rime segments, and individual phonemes.

Phonemic Awareness

A specific subskill of phonological awareness that involves isolating, segmenting, blending, and manipulating individual speech sounds (phonemes) in spoken words.

Dyslexia

A specific reading deficit characterized by difficulties with word-level decoding, phonological awareness, and letter-sound correspondence in the absence of primary comprehension deficits.

Reading Disability (RD)

A reading difficulty rooted in a primary weakness in oral language skills, presenting primarily as a language comprehension deficit.

Inflectional Morpheme

A bound grammatical morpheme that alters the grammatical form, tense, or number of a word (e.g., "-ed", "-ing", "-s") without changing its core semantic category or syntactic class.

Derivational Morpheme

A bound prefix or suffix added to a base word to create a new lexical item, typically altering the word's syntactic category or core semantic meaning (e.g., verb to noun).

T-unit

A terminable syntactic unit consisting of one main clause together with all subordinate clauses attached to it, used to evaluate syntactic complexity in school-age children.

Dynamic Assessment

An assessment approach using a test-teach-retest framework to assess a child's learning potential and modifiability within a structured teaching environment, distinguishing lack of opportunity from a true learning impairment.

Norm-Referenced Assessment

A standardized, decontextualized testing instrument that quantitatively compares a child's language abilities against a normative group of typically developing peers.

Criterion-Referenced Procedures

Assessment tasks designed to establish whether a child can achieve a specific level of performance or mastery on targeted communication behaviors, independent of peer comparisons.

Structural Analysis

An assessment procedure in which an SLP transcribes and examines a child's spontaneous connected speech sample to identify naturalistic structural forms, functions, and error patterns.

Facilitation

A therapeutic mechanism in which intervention accelerates the rate of language acquisition, helping a child achieve developmental milestones earlier than they would have on their own.

Maintenance

A therapeutic outcome where intervention preserves an existing communication behavior that would otherwise deteriorate, decline, or disappear.

Induction

A therapeutic outcome where a language behavior is achieved solely because intervention was provided, as the behavior would never emerge through natural maturation alone.

Zone of Proximal Development (ZPD)

The distance between a child's current independent performance and the higher level of performance they can reach with assistance from a competent adult.

Tier 2 Words

High-frequency vocabulary words across academic disciplines that are rare in casual conversation, offering precise descriptions that enhance comprehension across curricular domains.

Clinician-Directed Therapy

A highly structured intervention framework (drill, drill play, modeling) where the SLP determines all goals, stimulus items, activities, and reinforcement schedules to maximize response frequency.

Child-Centered Therapy

A naturalistic therapy approach where the SLP follows the child's attentional focus and play choices, providing responsive linguistic models without demanding responses or delivering tangible rewards.

Self-Talk

A child-centered technique where the clinician describes their own actions aloud while engaging in parallel play alongside the child.

Parallel Talk

A child-centered technique where the clinician provides ongoing narration describing the actions, movements, and focus of the child.

Expansion

A modeling technique in which the clinician repeats a child's incomplete utterance while adding the grammatical morphemes required to produce an acceptable adult utterance.

Extension

A child-centered response where the clinician remarks upon the child's utterance and adds new semantic information to extend the conversation.

Recast Sentence

A responsive linguistic strategy where the clinician reformulates the child's utterance into a different grammatical sentence type or a more elaborated syntactic form.

Build-ups and Breakdowns

A child-centered technique where the clinician expands a child's utterance into a fully formed sentence, breaks it down into phrase-sized pieces, and rebuilds it to demonstrate sentence construction.

Focused Stimulation

A hybrid intervention method in which the SLP arranges communicative interactions to provide high-density models of a specific target form, tempting but not requiring the child to produce it.

Milieu Therapy

A naturalistic hybrid approach that arranges the physical environment and uses interactive play to elicit targeted language goals, relying on conversational consequences rather than extrinsic reinforcers.

Echolalia

The immediate or delayed repetition of words, phrases, or vocal patterns heard from others, frequently observed in children with Autism Spectrum Disorder.

Mazes

Disruptions in connected speech formulation characterized by false starts, fillers, revisions, and verbal repetitions, commonly seen in children with ADHD.

Down Syndrome

A genetic condition caused by trisomy 21 that is the most common genetic cause of intellectual disability, featuring hypotonia, oral-motor structural differences, and expressive syntax delays that exceed receptive skills.

Williams Syndrome

A neurodevelopmental disorder characterized by extreme gregariousness, marked social anxiety, and relative strengths in verbal expression and morphology paired with severe visual-spatial deficits.

Fragile X Syndrome

The most common inherited form of intellectual disability, caused by an X-chromosome mutation, presenting with executive function deficits, pragmatic language difficulties, and high co-occurrence with autism.

Conductive Hearing Loss

A form of hearing impairment caused by interference with the transmission of sound from the external canal to the inner ear (often due to otitis media) while inner ear function remains intact.

Sensorineural Hearing Loss

An irreversible hearing loss caused by structural damage to the inner ear hair cells or auditory nerve pathway, requiring amplification or surgical cochlear implantation.

Otitis Media

An inflammation or infection of the middle ear that produces fluctuating conductive hearing loss, which can exacerbate language learning difficulties in vulnerable populations.